Sheave or capstan



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Dec. 6, 1960 c. o. BRUESTLE SHEAVE OR CAPSTAN 3 Sheets-Sheet 3 Filed Sept. 20, 1957 INVENTOR. Q- flm 0. 5EUES7LE BY ATTOEA/EKS United States Patent SI-IEAVE 0R CAPSTAN Carl 0. Bruestle, Metuchen, N.J., assignor to Syncro Machine Company, Perth Amboy, N.J., a corporation of New Jersey Filed Sept. 20, 1957, Ser. No. 685,151

Claims. (Cl. 205-20) The present invention reates to the wire drawing and annealing art and particularly to a capstan or sheave.

In the past many wire drawing machines utilized capstans or wire blocks which were a unitary structure and in which the driving surface when worn was reconditioned by grinding to again produce a true cylindrical surface. This arrangement had the disadvantage that the slip ratio of the drawing machine was altered as a result of the grinding tending to produce wire of poor qaulity. In order to overcome this capstans have been made wherein a band was wrapped around the capstan to form the wearing surface. However, these bands were held in position by bending the ends thereof and fixing them in a gap in the underlying drum by suitable means such for example as by soldering. The result of this was that the surface was interrupted and the surface was not as truly cylindrical as was desirable. Additionally, in order to replace the band, it had to be unsoldered or otherwise unfastened.

The present invention relates to replaceable bands for capstans and sheaves and particularly to such bands which, when in their operating position, are truly cylindrical and do not leave any material gap between the band ends.

More particularly still, the present invention relates to bands which are held against a tiuly cylindrical surface by a holding member thus making removal and replacement simple and easy.

Bands of the type of the instant invention are also usable in sheaves of annealing machines and are particularly adapted to this use because the bands may be made of suitable material so that they readily conduct the currents required in machines in which the annealing heat is produced by passing an electrical current through the wire.

It is an object of my invention to produce capstans or sheaves having replaceable bands constituting a true cylindrical driving surface.

It is another object of my invention to provide such bands in a structure whereby the bands may be locked into position without in any way deforming them from the true cylindrical surface necessary.

It is a further object of my invention to produce such bands and cooperating structure so arranged that the bands may be readily removed and replaced.

It is another object of the invention to provide such replaceable capstan or sheave bands which provide good electrical contact to a wire passing over the surface of the band.

Other objects and features of the invention will be apparent when the following description is consldered in connection with the annexed drawings, in which,

Figure 1 is a top plan view of a capstan or sheave constituting one embodiment of my invention;

Figure 2 is a diametrical cross-sectional view of the capstan of Figure 1 showing particularly the mode of 2,963,145 Patented Dec. 6, 1960 expanding the hand against a cooperating portion of the capstan hub and cover;

Figure 3 is a fragmentary cross-sectional view taken on the plane of the line 3-3 of Figure 1 and showing the mode of fixing the band and cooperating ring in position between the capstan hub and cover;

Figure 4 is a cross'sectional view of a second embodiment of my invention wherein the expanding ring and capstan cover are made in a single piece;

Figure 5 is a cross-sectional view of a third embodiment of my invention similar to that of Figure 4, but expanded into position by a diiferent means;

Figure 6 is a top plan view of a capstan or sheave in accordance with a further modification of my invention;

Figure 7 is a diametrical cross-sectional view of the capstan of Figure 6 the view being taken on the plane of the line 66 of that figure;

Figure 8 is a view similar to that of Figure 7 but taken on the plane of the line 88 of Figure 6;

Figure 9 is a top plan view of a modified form of the Figure 6 embodiment wherein the constraining ring is split and provided with a hinge; and

Figure 10 is a top plan view of another modification wherefn the constraining ring has a single split but no hinge is provided.

Referring now to the drawings and particularly to Figures 1 through 3, there is shown at 10 a capstan hub which has a recessed portion 11 providing the shoulder 12 adjacent the periphery. A band 13 is seated in the recess 11 abutting the shoulder 12, this band being made of suitable material as for example heat treated steel or bronze, to serve as a capstan driving surface or as a contact material for an annealing sheave. The band is slightly shorter than the internal circumference of the shoulder 12 so that a small gap such as is indicated at 14 remains. Within the band 12 there is placed a ring 15, the ring being provided with a tapped tapered hole at 16. Centrally of this tapped opening the ring 15 is slotted as shown at 17 so that the ring may be expanded by inserting a tapered plug as indicated at 18 into the opening 16. A capstan cover 20 is provided, this cover being recessed and providing a shoulder 21 similar to the shoulder 12 of the hub 10. Cover 20 is seated on the ring and band as shown particularly in Figure 2 and bolts 23 are then passed through the cover and through clearance holes in ring 15 and threaded into the hub 10. After the structure has been thus assembled, plug 18, which is provided with means for rotating, such for example as an Allen socket, is screwed home until the band 13 is expanded by expansion of the ring 15 and seats against the shoulders 12 and 21. After this the screws 23 are further tightened to assure that there will be no movement during operation.

The structure as above described is simple and makes possible a rapid and easy replacement or substitution of one band 13 for another. It, however, has a disadvantage in that it is essential that the circumference of the recesses in the hub 10 and cover member 20 be held to very close tolerances since if they are not, the band will expand against one of the shoulders 12 and 21 and will not make contact with the other of these shoulders. Additionally, with the structure of Figures 1 through 3, only a small portion of the surface of band 13 is ever used, namely, the portion between the facing edges 24 and 25 of the hub 10 and cover 20 respectively.

These disadvantages are overcome in the preferred structure shown in Figure 4. In this instance the structure comprises a split expansion ring consisting of a cylindrical portion 15 having an outwardly extending peripheral flange 26. Further, the shoulder 12 of hub 10 is increased in depth and no shoulder is provided at the flange 26. As a result the upper portion of the band only is used and when this part becomes worn the band is reversed, and what was the lower portion thereafter utilized, the worn portion then being out of service. Moreover, because there is but a single shoulder against which the band 13 is expanded the tolerances need not be accurately maintained and the structure is therefore much less expensive to manufacture.

The arrangement of Figure 4 is, insofar as the expanding means are concerned, identical with that of Figures 1 through 3 and substantially identical with that of Figures 1 through 3 as respects the mode of fastening the split expansion ring to hub 10. The minor differences which exist are obvious in the drawings.

Referring now to Figure 5, there is shown therein a structure which is similar to that of Figure 4 insofar as the use of the combined cover and the split expansion ring is concerned, but which differs from the structure previously described in that a different means of expanding the split expansion ring in the hub 10 is utilized. In this connection it should be understood that the expanding means of Figure might be utilized with a separate ring 15 and cover 20 of Figures 1 through 3. "In the structure of Figure 5 the hub is provided with a circumferential depression 27, the outer portion of which is vertical as seen in Figure 5 and forms a shoulder 12, the inner surface 28 being inclined and mating with a similarly inclined portion 30 of the split ring so that as it is pulled into place in the recess 27, it is expanded to thereby expand the band 13 against shoulder 12. However, the arrangement of Figure 4 is a preferred one since expansion by means of the tapered plug is achieved without use of the securing bolts 23 whereas in the arrangement of Figure 5 the expansion occurs as the ring 15 is drawn into position by bolts 23. As a result, care must be exercised to draw the ring 15 into its recessevenly throughout its periphery which necessitates a more skillfully performed and more time-consuming operation.

Referring now to Figures 68, there is shown therein a form of capstan with a removable band when the band is held in place by a ring which contracts the hand against a cylindrical surface. The capstan hub 30 of these figures is provided with the cylindrical surface 31 and with the outwardly extending flange 32.

In this instance the ring 33, similar to ring 15, is, however, split at points 34 and is provided with an axially extending flange 35. As is readily seen when the sections of ring 33 are assembled on the hub 30 they compress the band 36 against surface 31 and, since the band has an inner circumferential dimension only very slightly less than that of the surface, there is but a very slight gap in the band surface such as that indicated at 37 in Figure 6. Ring 33 is contracted against the band 36 by use of screws 38 each of which passes through a clearance hole in one ring section and into a tapped hole in the other. As will be understood the heads 40 of bolts 38 lie in countersunk holes in the respective ring sections.

In the form of the invention the ring 33 acts as a partial cover for the hub 30 and after being constructed as described is fixed to the hub by screws 41 which pass through clearance holes 42 in the cover and engage tapped holes 43 in the hub 30. As will be obvious the band 36 may be reversed to provide an additional wearing surface since only the portion of the surface between hub flange 32 and ring flange 35 is utilized.

In some instances a ring split into two sections as described may be somewhat difficult to install, therefore in Figure 9 I show a modification in which the ring 33 is composed oftwo sections pivoted together by a pin 44 and provided with complementarilycurved end portionsas shown M45 a tongue on one section entering a slot of the other.

With a slightly resilient material the hinged arrangement of Figure 9 is not necessary and thus there is shown in Figure 10 an arrangement in which the ring 33 is provided with a single split 34. The device of Figure 10 is then essentially the same as that of Figures 6-10.

While I have described a preferred embodiment of the invention, it will be understood that I wish to be limited not by the foregoing description, but solely by the claims granted to me.

What is claimed is:

l. A capstan or sheave comprising, in combination, a disk-like body having an axially extending flange forming a cylindrical shoulder, a band with its ends juxtaposed formed into a cylinder seating against said shoulder, and means axially overlapping said shoulder for forcing said band radially against said shoulder to lock it against movement, said band forming the driving and wearing surface of the capstan.

2. A device according to claim 1 wherein said last means comprises a split ring within said band and means for expanding said ring against said band and said band against said shoulder.

3. A device according toclaim 2 wherein said ring is provided with an outwardly'extending peripheral flange extending beyond said band, said body flange and ring flange forming rims on the capstan and means for fixing said expanded ring on said body.

4. A device according to claim 2 wherein said ring expansion means comprises a tapered hole extending through said ring perpendicular to and on the center line of said split and a tapered plug in said hole.

5. A device according to claim 1 wherein a disk-like cover member is fixed to said body, said member having an axially extending flange forming a shoulder, said flanges of said cover and body members facing" each other, said band seating against both the shoulder of said body and of said cover, said flanges forming rims at the opposite sides of the capstan.

References Cited in the file of this patent UNITED STATES PATENTS 824,655 Horton June 26, 1906 1,847,567 Lorenz Mar. 1, 1932 1,981,196 Riblet Nov. 20, 1934 2,232,206 Bruestle Feb. 18, 1941 2,269,821 Kemphert et a1 J an. 13, 1942 FOREIGN PATENTS 7,489 Great Britain Apr. 8, 1905 

